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Re: mips 32 bit HIGHMEM support

To: exister99@velocitus.net
Subject: Re: mips 32 bit HIGHMEM support
From: Ralf Baechle <ralf@linux-mips.org>
Date: Fri, 10 Oct 2003 16:59:49 +0200
Cc: linux-mips@linux-mips.org
In-reply-to: <20031009140319.GA17647@linux-mips.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <5334.156.153.254.2.1065650433.squirrel@webmail.rmci.net> <20031009140319.GA17647@linux-mips.org>
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On Thu, Oct 09, 2003 at 04:03:20PM +0200, Ralf Baechle wrote:

> It's got a limitation - it only works on physically indexed D-caches or
> more exactly processors that don't suffer from cache aliases.  On
> processors that have such aliases the necessary flushes are rather bad
> for performance so this currently simply isn't suported.

Small update - I changed the memory managment code to ignore highmem
on cache configuration that are not supported by the highmem code.

  Ralf

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